GB2310475A - Shock absorber - Google Patents

Shock absorber Download PDF

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Publication number
GB2310475A
GB2310475A GB9703270A GB9703270A GB2310475A GB 2310475 A GB2310475 A GB 2310475A GB 9703270 A GB9703270 A GB 9703270A GB 9703270 A GB9703270 A GB 9703270A GB 2310475 A GB2310475 A GB 2310475A
Authority
GB
United Kingdom
Prior art keywords
piston rod
shock absorber
adjusting device
spring
hydraulic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9703270A
Other versions
GB2310475A8 (en
GB2310475A9 (en
GB9703270D0 (en
GB2310475B (en
Inventor
Joachim Wirtz
Helmut Luncz
Peter Fritz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
Mercedes Benz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler Benz AG, Mercedes Benz AG filed Critical Daimler Benz AG
Publication of GB9703270D0 publication Critical patent/GB9703270D0/en
Publication of GB2310475A publication Critical patent/GB2310475A/en
Publication of GB2310475A8 publication Critical patent/GB2310475A8/en
Publication of GB2310475A9 publication Critical patent/GB2310475A9/en
Application granted granted Critical
Publication of GB2310475B publication Critical patent/GB2310475B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/027—Mechanical springs regulated by fluid means
    • B60G17/0272—Mechanical springs regulated by fluid means the mechanical spring being a coil spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/041—Wound springs with means for modifying the spring characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/12—Wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/40—Type of actuator
    • B60G2202/41—Fluid actuator
    • B60G2202/413—Hydraulic actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/124—Mounting of coil springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/30—Height or ground clearance

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

In a spring shock absorber for a vehicle, the spring 13 is tensioned between an annular collar 14 of a movable housing 7 and the damping cylinder 3 of the shock absorber by a change in the volume of the hydraulic space 6. The housing 7 is mounted so as to slide on the piston rod 4 and an upper sleeve thereof.

Description

1 SRring shock absorber device of a motor vehicle 2310475 The invention
relates to a spring shock absorber device between the wheels and the body of a motor vehicle, in which a shock absorber and spring extend equiaxially, the shock absorber comprises a damping cylinder and a piston rod which interacts with the latter, and it is attached directly between the body of the vehicle and a guide element of a wheel, the spring is tensioned between a body-side and a wheel-side abutment, and at least one of these abutments is axially adjustable by means of a hydraulic adjusting device, a movable element of the adjusting device, constituting one of the two abutments for the spring, engages around an area of the shock absorber and slides on the latter via interposed sealing rings when actuated.
Such a device is known, for example, from DE 42 31 641 Al. In that publication, the movable part of the hydraulic adjusting device slides over a cylinder which is fixedly connected to the vehicle body. The shock absorber with, inter alia, its damping cylinder is located within this cylinder. Located between the movable element of the hydraulic adjusting device and the cylinder which is rigidly connected to the body of the vehicle is an annular operating space of the adjusting device, which operating space is filled with hydraulic fluid and is sealed by means of annular seals, provided at the axial ends of the movable element of the adjusting device, between the movable element and the cylinder which is fixedly connected to the vehicle body. Since the cylinder which is fixedly connected to the vehicle body must accommodate the damping cylinder of the shock absorber, it has a relatively large outside diameter. As a result, the annular seals of the movable element of the adjusting device must have a correspondingly large circumference, thus causing comparatively high friction forces to occur due to the seal when the movable element is displaced. Such high friction forces are disadvantageous and undesirable in adjusting devices to control and regulate the handling characteristics 2 of a vehicle. This applies, in particular, to an adjusting device used according to the possibilities described in DE 42 31 641.
A spring shock absorber device according to DE 23 60 149 also has the disadvantage of relatively high friction forces in the actuation of a hydraulic adjusting device of this type. In that publication, the hydraulic adjusting device slides over sealing rings on the outer surface of the damping cylinder of the shock absorber.
According to the present invention there is provided a spring shock absorber device adapted to be located between the wheels and the body of a motor vehicle, in which a shock absorber and spring extend equiaxially, the shock absorber comprises a damping cylinder and a piston rod which interacts with the latter, and it is attached directly between the body of the vehicle and a guide element of a wheel, the spring is tensioned between a body-side and a wheel-side abutment, and at least one of these abutments is axially adjustable by means of a hydraulic adjusting device, a movable element of the adjusting device, constituting one of the two abutments for the spring, engages around an area of the shock absorber and slides on the latter via interposed sealing rings when actuated, wherein the spring is stressed relative to the damping cylinder of the shock absorber as the other abutment, and the movable element of the adjusting device slides on the shock absorber, solely on its piston rod.
The objective of reducing the friction forces is achieved in this case in that the seals which are significant in generating the friction force slide on a circumference which is as small as possible, this small circumference being achieved by means of the piston rod which is small in terms of diameter.
A preferred embodiment of the invention, the movable element of the adjusting device is a cylindrical housing which engages with clearance around the piston rod, is sealed at its end relative to the said piston rod and slides on a thickened 3 area of the piston rod at its end located away f rom the damping cylinder, the thickening being f ormed by a tubular sleeve engaging with clearance around the piston rod at that point, and the hydraulic fluid actuating the hydraulic adjusting device can be conveyed through an annular gap between the tubular sleeve and the piston rod into a hydraulic operating space between the cylindrical housing and the piston rod.
An exemplary embodiment of the invention is illustrated in the drawing which shows a longitudinal section through a spring shock absorber device representing one spring leg of a motor vehicle.
The spring leg is arranged so as to be pivotable by means of universal joints with a body-side joint 1 on a vehicle body (not illustrated) and with a wheel-side joint 2 on a wheel-guiding element (likewise not illustrated), for example an axle.
In the spring leg, the damping cylinder 3 of the shock absorber adjoins the wheel-side joint 2, while the piston rod 4 of the said shock absorber is connected to the body-side joint 1. The piston rod 4 projects out of the damping cylinder 3 over a relatively large area. In this area, a hydraulic adjusting device 5 acts on the piston rod 4. The purpose of this hydraulic adjusting device is to change the driving position of the vehicle or to adapt it to the respective current operating conditions. By means of such an adjusting device, it should be possible for, in particular, yaw and rolling movements or oblique positions of the vehicle body to be compensated automatically. How this can be done specifically with a device of this type is described in detail, inter alia, in DE 42 31 641 Al, so that it is not necessary to describe the relevant functioning in detail here.
The adjusting device 5 has a cylindrical housing 7 as a movable element to change the volume of a hydraulic operating space 6. The said housing 7 is sealed at its axial ends relative to the piston rod 4 by means of annular seals 8 to provide a sealed termination of the hydraulic operating space 6. The lower one of these two seals 8 acts in'an area 4 of the piston rod 4 in which the latter has a first diameter up to a displacement piston 9 inside the damping cylinder 3. The upper seal 8, in contrast, engages around the piston rod 4 in an area with a larger second diameter. The larger second diameter is achieved by a tubular sleeve 10 around the piston rod 4. An annular gap 11 between the tubular sleeve 10 and the piston rod 4 located radially inside it serves as a hydraulic fluid supply line to and from the hydraulic operating space 6. The annular gap 11 is connected via a line 12 to a controlled or regulated hydraulic fluid store (not illustrated).
By displacement owing to a change in the volume of the hydraulic operating space 6, the distance between the two joints 1 and 2 is changed. With the volume of the hydraulic operating space 6 kept constant, the cylindrical housing 7 of the hydraulic fixing device 5 is functionally fixedly connected to the piston rod 4. In this case, by connection to the joint 1 via a spring 13, the vehicle body rests on the damping cylinder 3 of the shock absorber. In this case, an annular collar 14 present on the cylindrical housing 7 constitutes the body-side abutment of the spring 13, while the wheel-side abutment 15 is a bell-shaped annular collar 15 which is fixedly connected to the upper end of the damping cylinder 3. If deflection or rebound of the spring 13 caused on the wheel side when the adjusting device 5 is inactive, that is to say when the cylindrical housing 7 is resting relative to the piston rod 4, only the damping cylinder 3 moves for vibration damping with the piston rod 4 virtually at rest.
The cylindrical housing 7 of the hydraulic adjusting device 5 can the displaced by a change in volume of the hydraulic operating space 6 between stops 16 and 17 of the piston rod 4. In this area, the height of the vehicle body, that is to say the distance between the two joints 1 and 2, can thus be changed. To limit the vibration amplitude of the shock absorber, a padded stop 18 which can strike against the damping cylinder 3 is provided on the piston rod 4 on the side remote from the stop 17.
A further padded stop 19 serves as a protection for the spring 13 in order to prevent any contact with its turns, which would be possible at the maximum stroke of the adjusting device 7 and the maximum deflection of the damping cylinder 3.
The piston rod 4 may be composed of a plurality of individual elements and may have different diameters over its length. In the exemplary embodiment shown, the piston rod 4 is divided into two parts over its length, each being of tubular design.
6 claims A spring shock absorber device adapted to be located between the wheels and the body of a motor vehicle, in which a shock absorber and spring extend equiaxially, the shock absorber comprises a damping cylinder and a piston rod which interacts with the latter, and it is attached directly between the body of the vehicle and a guide element of a wheel, the spring is tensioned between a body-side and a wheelside abutment, and at least one of these abutments is axially adjustable by means of a hydraulic adjusting device, a movable element of the adjusting device, constituting one of the two abutments for the spring, engages around an area of the shock absorber and slides on the latter via interposed sealing rings when actuated, wherein the spring is stressed relative to the damping cylinder of the shock absorber as the other abutment, and the movable element of the adjusting device slides on the shock absorber, solely on its piston rod.

Claims (1)

  1. 2. A device according to Claim 1, wherein the movable element of the
    adjusting device is a cylindrical housing which engages with clearance around the piston rod, is sealed at its end relative to the said piston rod and slides on a thickened area of the piston rod at its end located away f rom the damping cylinder, the thickening being formed by a tubular sleeve engaging with clearance around the piston rod at that point, and the hydraulic fluid actuating the hydraulic adjust ing device can be conveyed through an annular gap between the tubular sleeve and the piston rod into a hydraulic operating space between the cylindrical housing and the piston rod.
    3. A spring shock absorber device adapted to be located between the wheels and the body of a motor vehicle, substantially as described herein with reference to, and as illustrated in, the accompanying drawings.
GB9703270A 1996-02-24 1997-02-17 Spring shock absorber device of a motor vehicle Expired - Fee Related GB2310475B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19606991A DE19606991C2 (en) 1996-02-24 1996-02-24 Spring vibration damper device of a motor vehicle

Publications (5)

Publication Number Publication Date
GB9703270D0 GB9703270D0 (en) 1997-04-09
GB2310475A true GB2310475A (en) 1997-08-27
GB2310475A8 GB2310475A8 (en) 1997-09-01
GB2310475A9 GB2310475A9 (en) 1997-09-01
GB2310475B GB2310475B (en) 1998-03-04

Family

ID=7786346

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9703270A Expired - Fee Related GB2310475B (en) 1996-02-24 1997-02-17 Spring shock absorber device of a motor vehicle

Country Status (5)

Country Link
US (1) US5810335A (en)
DE (1) DE19606991C2 (en)
FR (1) FR2745238B1 (en)
GB (1) GB2310475B (en)
IT (1) IT1290928B1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
ITTO20100695A1 (en) * 2010-08-13 2012-02-14 Sistemi Sospensioni Spa SUSPENSION FOR VEHICLE INCLUDING AN ADJUSTMENT DEVICE FOR THE HEIGHT OF THE GROUND VEHICLE BODY

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DE19655013A1 (en) * 1996-02-08 1999-01-21 Mannesmann Sachs Ag Piston and cylinder assembly
DE19606990C2 (en) * 1996-02-24 1999-10-28 Daimler Chrysler Ag Telescopic vibration damper between the structure and the guide element of a wheel of a motor vehicle
DE19908607B4 (en) * 1999-02-27 2005-05-12 Daimlerchrysler Ag Air strut for suspension of motor vehicles
DE10109555A1 (en) * 2001-02-28 2002-09-05 Bayerische Motoren Werke Ag Suspension strut with adjustable preload
DE10126072C1 (en) * 2001-05-28 2002-11-28 Martin Hofer Gmbh Shock absorber for a vehicle comprises a piston in a cylinder, a spring device consisting of a main spring and a secondary spring, and a height-adjustable intermediate spring plate
DE10153007A1 (en) * 2001-10-26 2003-05-08 Audi Ag Height adjustment device
DE10237644B4 (en) * 2002-08-13 2006-01-19 Zf Sachs Ag Spring carrier with a height-adjustable spring plate
US20040159515A1 (en) * 2003-02-19 2004-08-19 Bell Stephen H. Coil over shock absorber with spring seat load adjusted damping
DE10336155B3 (en) * 2003-08-07 2005-03-17 Zf Friedrichshafen Ag Strut for vehicle suspension has second spring plate with radial play from second construction group
EP1559597A1 (en) * 2004-01-30 2005-08-03 House-of-tuning Device for level change in vehicles
KR100680389B1 (en) * 2004-12-15 2007-02-08 현대자동차주식회사 Wheel alignment and vehicle height adjusting apparatus
DE102005058945A1 (en) 2005-12-09 2007-06-14 Zf Friedrichshafen Ag Method for operating a drive train of a vehicle
DE102005059117B4 (en) * 2005-12-10 2014-11-13 Zf Friedrichshafen Ag Actuator for an active chassis of a motor vehicle
DE102005059116A1 (en) 2005-12-10 2007-08-16 Zf Friedrichshafen Ag Active chassis for a motor vehicle
DE102006005102B3 (en) * 2006-02-04 2007-09-13 Zf Friedrichshafen Ag Shock strut for use with vehicle body, has pressure-medium operated adjusting cylinder supported at piston rod in movable manner, where cylinder is supported at mounting head over ring-shaped elastomer intermediate body with mounting flange
DE102006006871A1 (en) * 2006-02-15 2007-08-23 Dr.Ing.H.C. F. Porsche Ag Adjustable strut for motor vehicles
US7677539B2 (en) * 2006-02-23 2010-03-16 Barnes Group Inc. Force control strut
DE102006025576B3 (en) * 2006-06-01 2007-12-27 Zf Friedrichshafen Ag Method for level control in a motor vehicle
DE102006026625B4 (en) * 2006-06-08 2008-11-13 Audi Ag Device for height adjustment of the construction of motor vehicles
DE102010006059A1 (en) 2010-01-28 2011-08-18 Daimler AG, 70327 Suspension strut for motor vehicle for assembly between vehicle body and relative wheel carrier movable to vehicle body, comprises piston cylinder aggregate containing hydraulic medium, and single-tube damper
FR3030375B1 (en) 2014-12-18 2018-08-31 Renault Sas HYDRAULIC FLOAT CONTROL DEVICE FOR MOTOR VEHICLE AND SUSPENSION AND DAMPING SYSTEM COMPRISING SUCH A DEVICE
US10300760B1 (en) 2015-03-18 2019-05-28 Apple Inc. Fully-actuated suspension system
GB2547479B (en) * 2016-02-22 2019-04-17 Jaguar Land Rover Ltd Suspension assembly for a vehicle
FR3049501B1 (en) * 2016-03-31 2018-04-20 Peugeot Citroen Automobiles Sa VEHICLE WITH HYDRAULIC SUSPENSION SYSTEM
US10814690B1 (en) 2017-04-18 2020-10-27 Apple Inc. Active suspension system with energy storage device
US11358431B2 (en) 2017-05-08 2022-06-14 Apple Inc. Active suspension system
US10899340B1 (en) 2017-06-21 2021-01-26 Apple Inc. Vehicle with automated subsystems
US11173766B1 (en) 2017-09-07 2021-11-16 Apple Inc. Suspension system with locking structure
US11065931B1 (en) 2017-09-15 2021-07-20 Apple Inc. Active suspension system
US11124035B1 (en) 2017-09-25 2021-09-21 Apple Inc. Multi-stage active suspension actuator
US10960723B1 (en) 2017-09-26 2021-03-30 Apple Inc. Wheel-mounted suspension actuators
DE102018212109A1 (en) * 2018-07-20 2020-01-23 Bayerische Motoren Werke Aktiengesellschaft Height adjustable spring assembly for a vehicle
US11285773B1 (en) 2018-09-12 2022-03-29 Apple Inc. Control system
US11634167B1 (en) 2018-09-14 2023-04-25 Apple Inc. Transmitting axial and rotational movement to a hub
US11345209B1 (en) 2019-06-03 2022-05-31 Apple Inc. Suspension systems
US11938922B1 (en) 2019-09-23 2024-03-26 Apple Inc. Motion control system
US11179991B1 (en) 2019-09-23 2021-11-23 Apple Inc. Suspension systems
WO2021078908A1 (en) 2019-10-25 2021-04-29 ILJIN Bearing GmbH Electromechanical vehicle height adjustment unit and vehicle height adjustment method
US11707961B1 (en) 2020-04-28 2023-07-25 Apple Inc. Actuator with reinforcing structure for torsion resistance
US11828339B1 (en) 2020-07-07 2023-11-28 Apple Inc. Vibration control system
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US4159105A (en) * 1978-02-21 1979-06-26 Bouvier Robert A Shock absorber with adjustable spring load
US4830395A (en) * 1988-02-22 1989-05-16 Foley Jimmy D Stabilizer system for racing cars
US5009451A (en) * 1988-07-19 1991-04-23 Kabushiki Kaisha Showa Seisakusho Shock absorber for use in a vehicle

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Publication number Priority date Publication date Assignee Title
US4159105A (en) * 1978-02-21 1979-06-26 Bouvier Robert A Shock absorber with adjustable spring load
US4830395A (en) * 1988-02-22 1989-05-16 Foley Jimmy D Stabilizer system for racing cars
US5009451A (en) * 1988-07-19 1991-04-23 Kabushiki Kaisha Showa Seisakusho Shock absorber for use in a vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20100695A1 (en) * 2010-08-13 2012-02-14 Sistemi Sospensioni Spa SUSPENSION FOR VEHICLE INCLUDING AN ADJUSTMENT DEVICE FOR THE HEIGHT OF THE GROUND VEHICLE BODY

Also Published As

Publication number Publication date
DE19606991A1 (en) 1997-08-28
US5810335A (en) 1998-09-22
GB2310475A8 (en) 1997-09-01
DE19606991C2 (en) 1998-11-12
FR2745238B1 (en) 2001-10-19
GB2310475A9 (en) 1997-09-01
ITRM970077A1 (en) 1998-08-14
IT1290928B1 (en) 1998-12-14
FR2745238A1 (en) 1997-08-29
GB9703270D0 (en) 1997-04-09
GB2310475B (en) 1998-03-04

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100217